function insertDashes(str) {
  const arr = [...str];
  return arr
    .map((value, i) =>
      arr[i + 1] === undefined || arr[i + 1] === ' ' || value === ' ' ? value : value + '-'
    )
    .join('');
}



/**
* Test Suite 
*/
describe('insertDashes()', () => {
    it('insert dashes in between chars', () => {
        // arrange
        const value = "aba caba";
        
        // act
        const result = insertDashes(value);

        // log
        console.log("result: ", result);
        
        // assert
        expect(result).toBe("a-b-a c-a-b-a");
    });
});